A brainless genius
A brainless genius is someone who does dumb stuff so well it looks like they’re brilliant and everyone else is a brainless idiot for thinking they actually know what they’re doing
I said I was going to be a singer and now I sing in the mall and people throw food at me
I told my teacher I was going to be the best student and now I have a detention for drawing on the desk
I said I’d pass the test and now it failed me and I failed it so hard it cried